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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1e1c422f9f15fdd2a2363e07ba50b410942f5cfd345b9a6c7deab608f6738b' 
  AND token = 'MA2phtKjKIXmrX7OMNPCAgqYSDOFTAe5FxS0O2BQohI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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