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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4d7f214fe03632c4f0df8743dc10ed30421b5e65963e0f718892748e568f05' 
  AND token = '4HLWyH7qkuESNIVWHpa2e+dwGij/eUW19MC1t0joHWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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