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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02df8a51d817e62b411f1f91e9afa3f744ed8286bbc992bcb58b70078656379f' 
  AND token = 'iLqQ+4Cp7cS8xW/6bmHKwa1T6/fe7eb9Xp4lVXuIlm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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