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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18138cbe60d1bd263c02f2611d8a73c8c07884c8fd347f346d92494eafeba9f6' 
  AND token = 'snSl/inaLoPOa1n+ZcC6cgIesfFXeGNt6ePGxrBFRF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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