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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42920f8cdfe026aaedf20ec0d0d05a5b93062ac6e7e2f0c78c40e751d9c0054' 
  AND token = 'pkDJq8FY20WuSClw3LtbHMfAcCt2s8QS06+5y9FIquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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