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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad5c850c74e54803d5971f0b52f4a60e088a32b2a98187a94388f7e874a1a7a' 
  AND token = '7sVkJMi+9YsvZAAwt38qPjMH65tWSeOhHt95frnw2CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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