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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea2b2ac2c083cf8a52bcfe06cf31d5b7a412c72c3915894ba3ac0ce02c91977' 
  AND token = 'sp2ftjYvLbBwgm6I2HViWq6GgDr/13VTJKacp8cIaCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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