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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12c843a08e756f03bfb38578d00a191867644d6dea710f42f950f60a28002c1' 
  AND token = 'thM+c/e4w1p8ilR1KEDRXII1/hB11J1f/F80XzAqPEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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