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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa400b60792ac08cc0daa8f7d3a759ec761f7b36104a2fe2594453ce68d0c7d' 
  AND token = 'dI5bAV0BBzIRVIifWb/VVSBWOUvkJvunO3Azcr9Be7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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