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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc766fbce83517c3c45903f0a1d7d6aeb983a7883426b55d351dad82cc3b812' 
  AND token = 'A0d9SVz9f1uibxsYRbFTnOfMtsGesspm1CZt+Ufp+p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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