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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69c46734cfd825ec588f06b3a096be4c0b8f0634416178bf88f72b233603a2b' 
  AND token = '27UBO+yypHplWifWhCdbRjJNBz2bCm5p1WNCPJTX1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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