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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f40b5e46e758d992956b540c51a4b776696af9c472b90bd002aa8bdcaf43c6' 
  AND token = 'zMDxk3wJzGkfW3tXk74HWyEGR8JI+1tCyxr4dub/5ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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