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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b58dd8b6093bd89a493ad5390f9f7ad8122d2c1ce6387f57f1736078b96cb7' 
  AND token = 'RGkQfsvG9LQID8EFrz63MGh6HL+xGL0CanDjzMG1z3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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