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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0188878a5b176f7e22e969eeaab115ff2a1dd39f98ff3600004d1882c658d9' 
  AND token = 'z3v5XpNghZegACkTV5mecfDOu7xXiRuI37J2Z1/Jo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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