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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e55dfdde9d9369fe0caebdcee73a3027d088148344278bd9ad3d4bacae4fd2' 
  AND token = 'maZ/6mtU/+gpelzmNaWZikm8R1oWVkbODD3wXE6oCyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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