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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed80021b980ac1ef82e90235194d99bafde2c4d5d5e7406057a529c8b4f7c433' 
  AND token = 'HvB/0BiknhAVeHIH4whr8FT8cqrLeItOt8dr76qIe7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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