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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c196f6c3fbecf246f092bb8a5ce7614f784ce8ca53fbed9eeaebccd5c88931a' 
  AND token = 'PJN5eq1ZWLZY5+W/e5skgvT7W+iQlCcJdiLjUwxl72Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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