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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251102906288b810326d9d86a04ed1fb6e42f2e879cac3127483684a895ccbc3' 
  AND token = 'yl6F78NYGyMIGTqVdc2yWQgmNXyyDbFGnMBdqsZqlP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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