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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2392305a7fa9b2c0a46fc28cf222cda5742118026ed97a378026f27078ca858' 
  AND token = '7GbC1YDneZEYCC4o7HjR+CcBXK+5oo8j2X5vfMvohcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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