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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a272082cbc13734042975216f7b4fea084fa56c55b8196a3a33000a090860d' 
  AND token = 'yJTm9/WKL7p+d/IdEXNdzIjOErm3+fmtF928/VxYAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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