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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af77a468bd9bfa00ae12979e07bd54b7a3b01a8f13a7e37026b7d54ba41905e5' 
  AND token = '+vyniHirwljLMthygNLLi61dp3JTrEAlO+id//SelYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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