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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c893fabc109c3cd86ebfb201dc0dc4e2994377b54cb08141240d61a65817dc4' 
  AND token = '0SkANK0G8/IyB6y2VTeV6wyOTErlimWP6wvJUFXIrKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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