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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd23161760e0930bbfc9e07811ba565ebcafb06d27feef5478f6628b1a95460' 
  AND token = 'I93LBjSbuvUFHsGK/q9lXrd6xbpUJniF3UVdm47LxRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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