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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1964c78b28400eac7b70e2418ac80e0b537d43159865f43ebcd71e3191fa8fde' 
  AND token = 'LQSzt15QF1Srn0ZPSD+pzelvfIFX42hC9o0GJ+K9174=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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