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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ebd7c0fafefbfe215b647b1ddbd83e61e98e18c7d71e704538180b6b558fc9' 
  AND token = 'VrXpjvPP3Xj/NTI1fLJ/XzFrnYdL0PssvZHXrLt220c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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