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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62222f6cd93191188a2943e96282fd1d4b1109a8ce33ce6ee70cf690aeda2df' 
  AND token = 'BxwD18zbfr3fabw0RHxyIf7efiuSPauSezYIsnsIi2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}