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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e9f57b3071c24519910c952bfac885d8b6176fc008560c550a45aa42d57c70' 
  AND token = 'Q/f2HPc+tVw2R9am25aI9iAfqcqO0vncCGT2gz9L6aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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