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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c92cd192ca828684c5b9de2e19ae025596b052a5aa419b592d7220fd66c7cac' 
  AND token = '3weIy4ABk6wdo5BK5kWKIjMvcWy+Fe7cuVayBZjKASg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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