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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf667c16c33b08dae2bd1ccc8fa661405b908931fde61f43d70714a8675a496' 
  AND token = 'R+5UC+9tz7m7ToJ0xLvI28WveKMtVFMSt5mu18F+JL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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