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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c60855673f061435224ef038801c2c384dd499049d7f0ad097480a92f3199a' 
  AND token = 'mWj/C4gdEYEa1IlwzfOz1z2f9QAMhH/3dRZzUy0UHDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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