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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a041137165e898631a2f38f72c15a82de81d74050cac143b4973f07631276b' 
  AND token = 'Ela2Ux1tknT4wtYsgRcGxC6O2AGuewU2aAMh7eLcnJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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