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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d8a27b9f1fae46eb7f1806887a2ef0e92f96eff07d3c124aa15ee379358c9b' 
  AND token = 'LHFz7o0++rPNpQDv/6bxHwwBbeW61prP1oviXai9G/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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