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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba154bf5814da25f031457cd344a5d34b0f800c69b5106fad158e986bc569afb' 
  AND token = 'Fz2xGp8rqOv0y1Sq+THbPvJva/l7fdjGl2592nmRHlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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