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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538fd626a5defeeb280946f74029ff95fca9b3c9f5f68bd4df0203fd448e1187' 
  AND token = 'FJA4bcWm9t70MwAJtI2Vcfz8CP4DdzCzbemGERLcLX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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