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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f68e0334fe7f9cb0e5ea1cf383a84c05f6ce00f36553f32000d0e11c5243ad' 
  AND token = '9DJvG5Z+Q2nMOHoHGeqcUcHR7S9m9J2kgJAG4/aNAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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