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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c7d3fd833f1a0a1b3a1b712dd053070caa79ea57753be668f4d11dbca0232' 
  AND token = 'zZABAL1hXuCGXsbKHo9zqBmooSe9euY5tmJPdq+tlrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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