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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60740146bd1a9bbb3bbdad073d5b9ad0eb1b4df965e0b2e5dcfb2561f15e362' 
  AND token = 'WWZPtBZM1MDhHGfvqh62Qgx0Fl+GlB1k+kUxOUJ3GJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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