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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1da04fd8a75e0ac7b1c25e153217ad1b0f0235c09814302739a73572e23e8bc' 
  AND token = 'sBktW8GSSq13b+9GNfdVG5CPiKSJJecuw4w03CLVmGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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