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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3134e1e6405b2d7c01756e61300f998a29f09268dd96e7408459b91db506c5' 
  AND token = 'Tr6npXUkgdCLs9R6LlD/JlgD0Jv4y6kTBMFq84iYc1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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