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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d913c2a490f874199e9707f4118e04720e8d521ad837d15e2d4d81427901bcf' 
  AND token = 'uXIPa2gCu2ea12oOH2qmYW20eWd+eR46+x4syjhrv0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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