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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d5420cec552ed2b0b85a5bd7f605e7d127156837f3160c074db8e110befd85' 
  AND token = 'O9H45ftyeumn88nURyiVNEQZFIGe49wnvEBMXXYudRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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