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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5c34a7bc6043ee46762e8c741f6fe7398b66ed0f52fc2e77c99709cb2b7093' 
  AND token = '09BEDiOFyUkqxg+Y5KQOMUvnij/jUkweJo/D+nEskp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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