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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bc9369b8b4b39cc9a0e666e12a78e3d81318abb37b145699478bcef9a62476' 
  AND token = 'OUhEn4GrwCV8flAenJhqh5vsQcDGh3OfOiLSjb7IbD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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